[quicwg/base-drafts] Rework Retry packet (#1498)

[Martin Thomson <[e-mail]>]

This includes several changes:

* I moved the Retry packet description.  It is more like Version Negotiation than Handshake or Initial, so it made sense to move it up.

* Retry doesn't include a packet number or payload.  Like Version Negotiation, it includes a complete definition.

* As discussed in #1451, this requires a server that might send another Retry to provide a connection ID of at least 8 octets.

* I clarified the description of fields, expanded the pictures, and made some other editorial tweaks.

Open Question: would it make sense to normalize the encoding of Retry and Initial?  The former includes a token without a length (because it's the last piece of the packet), whereas the latter includes a length-prefixed token.  It might be easier to invert the ODCID and token on Retry.  That would make the token processing more consistent.  I'm not sure if we want to consider adding a token to 0-RTT and Handshake packets, but that would fully normalize things.

Other open question (editorial): The variety of long header formats is now a little unwieldy.  Should we reduce the long header back to what is in invariants and describe the packet number encoding part as being specific to Initial, Handshake, and 0-RTT?  Something for editors to consider.

Closes #1492, #1451.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/1498

-- Commit Summary --

  * Rework Retry packet

-- File Changes --

    M draft-ietf-quic-transport.md (221)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/1498.patch
https://github.com/quicwg/base-drafts/pull/1498.diff

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